The allies also had low tech solutions that helped greatly. One such example is the Ghost Army which used decoys and the like to make it look like there was a large force.

https://www.nationalww2museum.org/visit/exhibits/traveling-e...

Last week, surviving members of the Ghost Army were honored in DC being awarded the Congressional Gold Medal.

https://www.npr.org/2024/03/21/1239871379/ghost-army-congres...